Hierarchical Low Si/Al Ratio Ferrierite Zeolite by Sequential Postsynthesis Treatment: Catalytic Assessment in Dehydration Reaction of Methanol

Table 5

Results of NH₃-TPD measurements.

Sample	NH3 uptake (µmol/gcat)	TM,LT^a (°C)	xLT^b	TM,HT^c (°C)	xHT^d
P	1178	239	0.39	460	0.61
D1	1128	234	0.39	458	0.61
C2	1025	234	0.38	454	0.62

^aTemperature of maximum desorption of NH₃ between 100 and 300°C. ^bFractional population of sites between 100 and 300°C. ^cTemperature of maximum desorption of NH₃ above 300°C. ^dFractional population of sites above 300°C.